78566122 has 4 divisors (see below), whose sum is σ = 117849186. Its totient is φ = 39283060.

The previous prime is 78566119. The next prime is 78566123. The reversal of 78566122 is 22166587.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22166587 = 1459 ⋅15193.

It can be written as a sum of positive squares in only one way, i.e., 57138481 + 21427641 = 7559^2 + 4629^2 .

It is a super-2 number, since 2×78566122² = 12345271052237768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78566123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19641529 + ... + 19641532.

Almost surely, 2^78566122 is an apocalyptic number.

78566122 is a deficient number, since it is larger than the sum of its proper divisors (39283064).

78566122 is a wasteful number, since it uses less digits than its factorization.

78566122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39283063.

The product of its digits is 40320, while the sum is 37.

The square root of 78566122 is about 8863.7532682267. The cubic root of 78566122 is about 428.2970722667.

The spelling of 78566122 in words is "seventy-eight million, five hundred sixty-six thousand, one hundred twenty-two".